package com.atguigu.gulimall.product.web;

import com.atguigu.gulimall.product.entity.CategoryEntity;
import com.atguigu.gulimall.product.service.CategoryService;
import com.atguigu.gulimall.product.vo.Catelog2Vo;
import com.sun.org.apache.regexp.internal.RE;
import org.redisson.Redisson;
import org.redisson.api.*;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.ResponseBody;

import java.util.List;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.TimeUnit;

@Controller
public class IndexController {
    @Autowired
    CategoryService categoryService;
    @Autowired
    RedissonClient redisson;
    @Autowired
    StringRedisTemplate redisTemplate;
    @GetMapping({"/","/index.html"})
    public String indexPage(Model model){
        //TODO 1.查出所有的1级分类
        List<CategoryEntity> categoryEntities = categoryService.getLevel1Categorys();

        //视图解析器进行拼串
        //classpath:/templates/+返回值+.html
        model.addAttribute("categorys",categoryEntities);
        return "index";
    }
    //index/catalog.json
    @ResponseBody
    @GetMapping("index/catalog.json")
    public Map<String, List<Catelog2Vo>> getCatalogJson(){
        Map<String, List<Catelog2Vo>> catalogJson = categoryService.getCatalogJson();
        return catalogJson;
    }
    @ResponseBody
    @GetMapping("/hello")
    public String hello(){
        //1.获取一把锁,只要锁的名字一样,就是同一把锁
        RLock lock = redisson.getLock("my-lock");
        //2.加锁
//        lock.lock();//阻塞式等待.默认加的锁都是30s时间
        //1).锁的自动续期,如果业务超长,运行期间自动给锁续上新的30s,不用担心业务时间长,锁自动过期被删除
        //2).加锁的业务只要运行完成,就不会给当前锁续期,即使不手动解锁,锁默认在30s以后自动删除.
        lock.lock(10, TimeUnit.SECONDS);//10秒自动解锁,自动解锁时间一定要大于业务的执行时间
        //问题:lock.lock(10, TimeUnit.SECONDS);在锁时间到了以后,不会自动续期
        //1.如果我们传递了锁的超时时间,就发送给redis执行脚本,进行占锁,默认超时就是我们指定的时间
        //2.如果我们未指定锁的超时时间.就使用30*1000[LockWatchdogTimeout看门狗的默认时间]
        // 只要占锁成功,就会启动一个定时任务[重新给锁设置过期时间,新的过期时间就是看门狗的默认时间],每隔10s都重新设置锁的过期时间,续成30s
        //  internallockleaseTime[看门狗时间]/3,10s

        //最佳实战
        //1).lock.lock(30,TimeUnit.SECONDS);省掉了续期操作.手动解锁.
        try{
            System.out.println("加锁成功,执行业务..."+Thread.currentThread().getId());
            Thread.sleep(30000);
        }catch (Exception e){

        }finally {
            //3.解锁 假设解锁代码没有运行,redisson会不会出现死锁
            System.out.println("释放锁..."+Thread.currentThread().getId());
            lock.unlock();
        }
        return "hello";
    }
    //保证一定能读到最新数据,修改期间,写锁是一个排他锁(互斥锁,独享锁).读锁是一个共享锁
    //写锁没释放读就必须等待
    //读+读:相当于无锁,并发读,只会在redis中记录好,所有当前的读锁.它们都会同时加锁成功
    //写+读:等待写锁释放
    //写+写:阻塞方式
    //读+写:有读锁.写也需要等待
    //只要有写的存在,都必须等待
    @GetMapping("/write")
    @ResponseBody
    public String writeValue(){
        RReadWriteLock lock = redisson.getReadWriteLock("rw-lock");
        String s = "";
        RLock rLock = lock.writeLock();
        try{
            //1.改数据加写锁,读数据加读锁
            rLock.lock();
            System.out.println("写锁加锁成功"+Thread.currentThread().getId());
            s = UUID.randomUUID().toString();
            Thread.sleep(30000);
            redisTemplate.opsForValue().set("writeValue",s);
        }catch (InterruptedException e){
            e.printStackTrace();
        }finally {
            rLock.unlock();
            System.out.println("写锁释放"+Thread.currentThread().getId());
        }
        return s;
    }
    @GetMapping("/read")
    @ResponseBody
    public String readValue(){
        RReadWriteLock lock = redisson.getReadWriteLock("rw-lock");
        String s = "";
        //加读锁
        RLock rLock = lock.readLock();
        rLock.lock();
        try{
            System.out.println("读锁加锁成功"+Thread.currentThread().getId());
            s = redisTemplate.opsForValue().get("writeValue");
            Thread.sleep(30000);
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            rLock.unlock();
            System.out.println("读锁释放"+Thread.currentThread().getId());

        }
        return s;
    }
    /**
     * 放假,锁门
     * 1班没人了,2
     * 5个班全部走完,我们可以锁大门
     */
    @GetMapping("/lockDoor")
    @ResponseBody
    public String lockDoor() throws InterruptedException {
        RCountDownLatch door = redisson.getCountDownLatch("door");
        door.trySetCount(5);
        door.await();//等待闭锁都完成
        return "放假了...";
    }
    @GetMapping("/gogogo/{id}")
    @ResponseBody
    public String gogogo(@PathVariable("id")Long id){
        RCountDownLatch door = redisson.getCountDownLatch("door");
        door.countDown();//计数减一
        return id+"班的人都走了...";
    }
    /**
     * 车库停车
     * 3车位
     * 信号量也可以用作分布式限流
     */
    @GetMapping("/park")
    @ResponseBody
    public String park() throws InterruptedException {
        RSemaphore park = redisson.getSemaphore("park");
//        park.acquire();//获取一个信号,获取一个值,占一个车位
        boolean b = park.tryAcquire();
        if(b){
            //执行业务
        }else{
            return "error";
        }
        return "ok=>"+b;
    }
    @GetMapping("/go")
    @ResponseBody
    public String go() {
        RSemaphore park = redisson.getSemaphore("park");
        park.release();//释放一个车位
        return "ok";
    }
}
